Messages - Derelict

How many states? I am unsure what the behavior is if there is not an available ephemeral source port for the outbound translation. You might need a pool of outbound NAT addresses if that is the case.

If you are truly seeing something intermittent there, that would be something I would certainly look at, especially if it only occurs during periods of high-traffic. That would take tens of thousands of simultaneous connections all to the same destination protocol:host:port however and seems unlikely.

Have you done anything like setting static source ports, reducing the available ephemeral source ports or maybe something else with outbound NAT?

It should run like a scalded ape on an R710. Unless you are caching, hard drive speed is pretty much irrelevant. Even if you are caching it is pretty much irrelevant.

I have never had any issues with the broadcom drivers. They seem fine. In fact, a few years ago, pfSense sold some used Dells. Can't remember the model but pretty sure they had bce NICs. Have personal experience running on some old IBM 1Us with zero issues. bce NICs there too.

Nothing wrong with a drive mirror for an install such as this. Though on that hardware you would be a candidate to try leaving the controller in JBOD and running a ZFS mirror if you put 8GB+ into it.

Doesn't really matter where he is. IPv6 is IPv6. If they will only give a single /64 it is the wrong product for the use case.

Not that I know of. Best case would probably be NPt with a ULA/64 on the inside interface. You would have to set up VIPs on the WAN which doesn't scale because you need something out there to respond to neighbor discovery.

A routed /64, /56, or /48 is what you want. Did you ask if that was available?